Add automated Rust toolchain upgrade workflow #743

Job	Run time
Test (macOS-latest)	9m 4s
Test (ubuntu-24.04)	8m 4s
Compiletest (windows-2022)	17m 3s
Test (windows-2022)	14m 18s
Difftest (macOS-latest)	12m 40s
Difftest (ubuntu-24.04)	13m 17s
Compiletest (macOS-latest)	8m 25s
Android (ubuntu-24.04, aarch64-linux-android)	8m 6s
Lint	5m 58s
Compiletest (ubuntu-24.04)	8m 17s
Difftest (windows-2022)	22m 59s
cargo-deny	1m 2s
test_success	2s
	2h 9m 15s

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